Clarification of Terms
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1 Clarification of Terms The Spine, Spinal Column, and Vertebral Column are synonymous terms referring to the bony components housing the spinal cord Spinal Cord = made of nervous tissue Facet = a small, smooth, flat surface on a bone Facet Joint = the articulation between the superior articular process of the vertebra below with the inferior articular process of the vertebra above Lippert, p Occipital Bone Temporal Bone Vertebrae Intervertebral Disk Atlas Axis C7 Osteology Lippert, p
2 Osteology cont Occipital Bone: Osteology cont Temporal Bone: Osteology continued Parts of a Vertebra Body Neural Arch Vertebral Foramen Pedicle Lamina Transverse Process Articular Process Spinous Process Neural Arch sp Vertebral foramen body 2
3 Typical Cervical Vertebrae Vertebrae: Osteology cont 3
4 Osteology cont Intervertebral Disks: 23 disks located between vertebrae, starting between C2 and C3 Function = absorb and transmit shock and maintain flexibility of the vertebral column Disks make up approx 25% of the total length of the vertebral column Lippert, p Osteology cont Intervertebral Disks cont: Annulus Fibrosus: outer portion of the disk consisting of several fibrocartilagenous rings that contain the nucleus pulposus Nucleus Pulposus: pulpy, gelatinous substance with high water content in the center of the disk Lippert, p215 Atlas: Caudal aspect 4
5 Axis: 2 nd Cervical Vertebra Posterior Aspect C7: Osteology cont 5
6 Examples of Vertebrae What can you palpate? What can you NOT palpate? Joint Structure Atlanto-Occipital Joint = articulation between condyles of occiput with atlas (C1) Strong union that supports the weight of the head Atlantoaxial Joint = articulation between atlas (C1) and axis (C2) Lippert, p217 6
7 Joint Structure cont Articulations between C2 through S1 = all basically the same Strong, weight bearing articulations occur anteriorly between the vertebral bodies Posteriorly, there are 2 articulations (one on each side) called facet joints (formed by the articular processes of adjacent vertebrae) Each facet joint = synovial joint with synovial membrane and capsular ligament The direction the facets face largely determine the type and amount of motion possible at that part of the vertebral column Lippert, p217 Joint Movement Atlanto-Occipital Joint Flexion and extension, no rotation Atlantoaxial Joint Rotation and some lateral flexion (aka sidebending) Cervical Spine Flexion, extension, rotation, sidebending Retraction = combined head flexion on C1 and C2-C7 extension Protraction = combined head extension C1 and C2-C7 flexion Thoracic Spine Facets in frontal plane Mostly rotation and lateral flexion Attachment of ribs contributes to lack of flexion and extension Lumbar Spine Facets in sagittal plane Most flexion and extension of vertebral column occurs in lumbar spine Lippert, p219 Supporting Structures Anterior longitudinal ligament Attaches the bodies of the vertebrae on the anterior surface Prevents excessive hyper extension Thin superiorly and thick inferiorly to fuse the sacrum Found in the thoracic and lumbar regions deep to the aorta Lippert, 218 7
8 Supporting Structures cont Posterior longitudinal ligament Attaches to the bodies of the vertebrae on the posterior surfaces inside the vertebral foramen Prevents excessive flexion Thick superiorly to help support the skull and thin inferiorly Contributes to instability and increased disk injury in the lumbar region. Lippert, 218 Supporting Structures cont Supraspinal ligament Extends from the 7 th cervical vertebra distally to the sacrum posteriorly along the tips of the spinous processes Interspinous ligament Attaches successive spinous processes Nuchal ligament Interspinous ligament in the cervical spine Lippert, 218 Supporting Structures cont Ligamentum Flavum Connects adjacent laminae on the anterior surface Lippert, 218 8
9 Recap 3 parts of spine Lumbar: Most injured region of the human body Absorbs the majority of our body weight plus any weight we carry Center of gravity located just anterior to the vertebral body of S2 Most movement occurs between L4/5 and L5/S1, most disk herniations occur here as well Thoracic: Much less motion than cervical and lumbar due to attachments to rib cage, the shape of vertebral bodies, and length of spinous processes Cervical: Moves freely Job is not weight distribution, but to support the head Allows nervous tissue to enter vertebral canal and entrance/exit of major blood vessels in the skull Lippert, p218 Myology Muscles of the neck and trunk are numerous and can be divided into anterior and posterior muscles. The Quadratus Lumborum (QL) is the only exception (located laterally) Anterior muscles the spine Posterior muscles the spine Lippert, p219 Cervical Anterior Superficial Sternocleidomasteoid (SCM) Scalenes Deep Longus colli and capitis Rectus capitis anterior and lateralis Posterior Superficial Splenius capitis and cervicis Erector spinae Deep Suboccipital muscles (rectus capitis posterior major and minor, obliquus capitis superior and inferior) 9
10 Cervical Anterior Superficial Sternocleidomasteoid (SCM) Scalenes Sternocleidomastoid Origin Insertion Innervation Action Sternal head: superior aspect of the manubrium of the sternum Clavicular head: medial 1/3 of the clavicle Mastoid process of the temporal bone Spinal accessory n. (cranial n. XI) Bilateral: Flexion of the head & neck Unilateral: Contralateral rotation of the head and neck Lippert, p Scalenes Origin Insertion Innervation Action Ant. Scalene: transverse processes of C3-C7 Middle Scalene: transverse processes of C2-C7 Posterior Scalene: transverse processes of C5-C7 Ant. Scalene: 1 st rib Middle Scalene: 1 st rib Posterior Scalene: external surface of the 2 nd rib Ventral rami (C3-C7) Bilateral: flexion of the neck, assist with inspiration by elevating ribs 1&2 Unilateral: lateral flexion Lippert, p220 10
11 Cervical Anterior Deep Longus colli = flexes neck Longus capitis = flexes head Rectus capitis anterior = flexes head Rectus capitis lateralis = laterally bends head Lippert, p221 Posterior Neck Superficial (Erector Spinae) Splenius capitis & cervicis= bilaterally = extends head and neck, unilaterally = rotates and laterally bends the face to same side Erector spinae = extensors which bring the head back from a flexed position Deep Suboccipital muscles (rectus capitis posterior major* and minor, obliquus capitis superior and inferior *) = extend the head and * also lateral bend and rotate to the same side Lippert, p Neck: Posterior: Superficial: Splenius capitis and cervicis 11
12 Neck: Posterior: Deep: Suboccipital Muscles Trunk Anterior Superficial to Deep: Rectus Abdominis External Oblique Internal Oblique Transverse Abdominis Posterior Superficial Erector spinae Deep Transverse spinal muscles Lateral Deep Quadratus Lumborum Trunk Anterior Superficial to Deep: Rectus Abdominis External Oblique Internal Oblique Transverse Abdominis 12
13 Rectus Abdominis Origin Insertion Innervation Action tidbits Crest of the pubis Xiphoid process and cartilages of ribs 5-7 Intercostal n. (T7-T12) Flexion of the trunk, posterior pelvic tilt, increases intraabdominal and intrathoracic pressure pregnancy? tendinous inscriptions? Lippert, p223 Strengthening Rectus Abdominis Crunch: to hold the ankles/feet down or not? Lippert, p External Oblique Origin Lateral side of ribs 4-12 Insertion Innervation Action Lippert, p223 Iliac crest and linea alba Intercostal nerves (T8- T12) Bilateral: Flexion of the trunk, posterior pelvic tilt, increased intra-abdominal and intra-thoracic pressure Unilateral: Rotation of the trunk to the contralateral side, ipsilateral lateral flexion of the trunk 13
14 Strengthening External Oblique When you do a crunch on a diagonal and bring your right shoulder toward your left knee, which external oblique is responsible for this motion? The right or left? Internal Oblique Origin Insertion Innervation Action Lippert, p223 Iliac crest, inguinal ligament & thoracolumbar fascia Ribs 9-12, linea alba Intercostal n. (T8-T12) Bilateral: flexion of the trunk, posterior pelvic tilt, increases intra-abdominal and intra-thoracic pressure Unilateral: ipsilateral lateral flexion of the trunk, rotation of the trunk to the ipsilateral side Strengthening Internal Oblique When you do a crunch on a diagonal and bring your right shoulder toward your left knee, which internal oblique is responsible for this motion? The right or left? 14
15 Lippert, p224 Strengthening Transverse Abdominis Lippert, p224 Trunk: Posterior: Superficial: Erector Spinae 3 muscles make up the erector spinae Medially = spinalis Attaches spinous process to spinous process Action = extension Intermediate = longissimus Attaches transverse process to transverse process Action = extension and lateral bending Laterally = iliocostalis Attaches transverse process to rib or rib to rib Action = extension and lateral bending 15
16 Trunk: Posterior: Deep: Transverse Spinal Muscle Group 3 muscles make up the Transverse Spinal Group They attach from transverse to spinous process Action = extension and rotation to the opposite side Most superficial = semispinalis (tend to span 5 vertabrae) Intermediate = multifidus (tend to span 2-4 vertebrae) Deepest = rotatores (span 1 vertebrae) (All run the entire vertebral column in layers) Lippert, p Trunk: Posterior: Deep: Transverse Spinal Muscle Group Trunk: Lateral: Deep: Quadratus Lumborum 16
17 Lippert, p Quadratus Lumborum Reversal of Muscle Action When the insertion moves toward the origin, what movement occurs? When the origin moves toward the insertion, what movement occurs? Which is open chain and which is closed chain? References Lippert, L.S. (2011). Clinical Kinesiology and Anatomy, 5 th ed. Philadelphia, PA: F.A. Davis. 17
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